android - Key receiving though my application is not in focus? -

I have a doubt in Android that there are two applications for A and B nomination. A. Application B has been started from application A. So far, B is in focus and all major programs will be received. Is it possible to get keys in a common place, even if the app is centered (A or B).

Is it possible for my application to know which key the user has pressed yet, though my application is not in focus?

Plz advise me as soon as possible ..

Thank you in advance ..

Is it possible to get keys in a common application (A or B) to focus on the place

No, sorry. This will be a huge security hole.